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Anthropic-Cybersecurity-Skills/skills/acquiring-disk-image-with-dd-and-dcfldd/references/api-reference.md
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mukul975 27c6414ca5 Add folder anatomy (scripts/agent.py + references/api-reference.md) for 648 cybersecurity skills
Complete skill folder anatomy across all cybersecurity skills:
- scripts/agent.py: 80-150 line Python agents using real libraries (impacket,
  boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.)
- references/api-reference.md: real API documentation with method signatures
- LICENSE: MIT license for all skill folders
2026-03-10 21:02:12 +01:00

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API Reference: dd and dcfldd Disk Imaging

dd - Standard Unix Disk Duplication

Basic Syntax

dd if=<source> of=<destination> [options]

Key Options

Flag Description Example
if= Input file (source device) if=/dev/sdb
of= Output file (destination image) of=evidence.dd
bs= Block size for read/write bs=4096 (forensic standard)
count= Number of blocks to copy count=1024
skip= Skip N blocks from input start skip=2048
conv= Conversion options conv=noerror,sync
status= Transfer statistics level status=progress

conv= Values

  • noerror - Continue on read errors (do not abort)
  • sync - Pad input blocks with zeros on error (preserves offset alignment)
  • notrunc - Do not truncate output file

Output Format

500107862016 bytes (500 GB, 466 GiB) copied, 8132.45 s, 61.5 MB/s
976773168+0 records in
976773168+0 records out

dcfldd - DoD Forensic dd

Basic Syntax

dcfldd if=<source> of=<destination> [options]

Extended Options

Flag Description Example
hash= Hash algorithm(s) hash=sha256,md5
hashlog= File for hash output hashlog=hashes.txt
hashwindow= Hash every N bytes hashwindow=1G
hashconv= Hash before or after conversion hashconv=after
errlog= Error log file errlog=errors.log
split= Split output into chunks split=2G
splitformat= Suffix format for split files splitformat=aa
vf= Verification file vf=evidence.dd
verifylog= Verification result log verifylog=verify.log

Output Format

Total (sha256): a3f2b8c9d4e5f6a7b8c9d0e1f2a3b4c5...
1024+0 records in
1024+0 records out

sha256sum - Hash Verification

Syntax

sha256sum <file_or_device>
sha256sum -c <checksum_file>

Output Format

a3f2b8c9d4e5f6...  /dev/sdb
a3f2b8c9d4e5f6...  evidence.dd

blockdev - Write Protection

Syntax

blockdev --setro <device>   # Set read-only
blockdev --setrw <device>   # Set read-write
blockdev --getro <device>   # Check: 1=RO, 0=RW
blockdev --getsize64 <device>  # Size in bytes

lsblk - Block Device Enumeration

Syntax

lsblk -o NAME,SIZE,TYPE,MOUNTPOINT,MODEL,SERIAL,RO
lsblk -J   # JSON output
lsblk -p   # Full device paths

hdparm - Drive Identification

Syntax

hdparm -I <device>   # Detailed drive info
hdparm -i <device>   # Summary identification